The "Pigeon Series" is a collection of children's books written by Mo Willems. The series features a humorous and relatable pigeon character who often tries to persuade readers to let him do things he shouldn't, like driving a bus or staying up late. The stories are known for their simple illustrations and engaging dialogue, making them appealing to young readers. Each book in the series encourages interaction, as the pigeon frequently addresses the audience directly. The series has received numerous awards and accolades, becoming a favorite among parents, teachers, and children alike for its entertaining and educational content.